In support of Billing MT sms

Hullo group,

in support of billing for MT messages, DLR is used ok?! However we found need to tie a transaction of the posted sms message to the smsbox,
and then the eventual DLR response.
Working off verson 1.3.1, added ability to add 
http://10.0.0.3:13013/cgi-bin/sendsms?user=foo&pass=bar&from=61428884524&to=1880123&text=hello+bimbo&charset=&udh=&mclass=0&coding=0&mwi=0&validity=&deferred=&dlrmask=31&tid=91
note the &tid=number

and then the
dlr-url=http://10.0.0.211/traker/WebForm1.aspx?receiver=%P&sender=%p&tid=%z

we can get the number back, is this useful to anyone else? i bet
implementation:

essentially..added  MSG(sms,.... INTEGER(tid); -- mesg-decl.h

code in smsbox to get the additional tag,

code in bearerbox dlr to save and restore the tid,

is there any interest in this ? for me to describe this up as a patch to be submitted?

PS: to match transactions you might be thinking source and destination etc in there already is enough,
but wasn't for us,